When we buy a gallon of milk, we pay for more than the milk.

The seller is passing on other costs, like packaging, transportation, milking equipment, etc.

As climate change approaches a breaking point, it is time to factor in other costs, such as greenhouse gas emissions and water usage related to the product.

We can no longer simply pay for the cost of making a product that is damaging the environment. We need also to pay for the associated cleanup costs.

Responsible companies will do this on their own, because it is the right thing to do.

And because governments are likely to get it wrong.